Internet Explorer has multiple versions, such as a version for embedded OEM devices running Windows Phone, Windows CE, and Windows Mobile (the latter was based on Internet Explorer 7) called Pocket Internet Explorer (later rebranded Internet Explorer Mobile), a version for the Xbox, and a version for the Macintosh and UNIX. Internet Explorer for Mac and Internet Explorer for UNIX have been discontinued.
On March 17, 2015, Microsoft announced that Microsoft Edge will replace Internet Explorer as the default browser for Windows 10 device, effectively making IE11 its last release. It will remain on some versions of Windows 10, however, primarily for legacy purposes.
As of 2019 Internet Explorer is discontinued, but still maintained however IE 8, 9, and 10 will also receive security updates.
Internet Explorer first debuted on August 16, 1995, coming with Microsoft Plus! for Windows 95 and the OEM version of Windows 95. It is a revamped version of Mosaic Spyglass, which Microsoft had licsensed from Spyglass, Inc. Because Internet Explorer was completely free, Microsoft was not required to pay royalties to Spyglass. This later resulted in a lawsuit, which was settled on January 22, 1997.